PROBLEM TO BE SOLVED: To provide an endoscopic observation assisting tool which is led out from within the conduit of the insertion section and placed on a distal-end surface of the insertion section to thereby stably secure the distance between a subject and a lens.SOLUTION: An endoscopic observation assisting tool 20 comprises: a body part 21 which is inserted into a conduit 7 extending from a hand side to a distal end of an insertion section 3 of an endoscope 2 with its portion at the distal side being protrudable from a distal-end surface 6a of the insertion section 3, and which is formed along a longitudinal axis a21； an assisting tool operation part 22 provided on a proximal end portion of the body part 21； and a deformation part 30 which is provided near the distal end portion of the body part 21 and deformable, by an operation of the operation part 22, to a state in which the deformation part is placed along an outer peripheral surface 21o of the distal end portion of the body part 21 to be receivable within the conduit 70 and to a state in which the deformation part forms a protrusion 36 axially outwardly relative to the outer peripheral surface 21o. A proximal-side vertex angle formation part 36r of the protrusion 36 is formed contactable with the distal-end surface 6a, and a distal-end surface of a distal end engagement portion 26 or a distal-side vertex angle formation part 36f is formed contactable with a subject 80.SELECTED DRAWING: Figure 5BCOPYRIGHT: (C)2020,JPO&INPIT【課題】挿入部の管路内から導出させて挿入部の先端面に配置することによって被検体とレンズとの間の距離を安定的に確保できる内視鏡用観察補助具を提供する。【解決手段】内視鏡用観察補助具２０は、内視鏡２の手元側から挿入部３の先端に至る管路７内にて、先端側部が挿入部３の先端面６ａより突出可能に挿通される、長軸ａ２１に沿って本体部２１と、本体部２１の基端部分に設けられた補助具操作部２２と、本体部２１の先端部分近傍に設けられ、操作部２２の操作によって、本体部２１の先端部分の外周面２１ｏに沿って配置されて管路７０内に収納可能な状態及び外周面２１ｏに対して径方向外側に突出した突出部３６を形成した状態に変位される変形部３０と、を具備し、突出部３６の基端側頂角形成部３６ｒは先端面６ａに当接可能に形成され、先端係止部２６の先端面または先端側頂角形成部３６ｆは被検体８０に当接可能に形成される。【選択図】図５Ｂ
